nav{
    width: 100%;
    height: 48px;
    background-color: #010001;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 999;
}
.nav-box{
    width: 1200px;
    height: 48px;
    margin: 0 auto;
    
}
.nav-box img{
    margin-top: 10px;
}
.nav-box .nav-t{
    width: 300px;
    height: 48px;
    line-height: 48px;
}
.nav-box .nav-t a{
    color:  #a4a4a4 ;
    margin-left: 40px;
}
.section{
    background-color: #010001;
}
/* 第一张 */
.section1{
    background: url(../images/section1_bg.jpg);
    background-position: center center;
    text-align: center;
   
    color: #ffffff;
}
.section1 .title-box{
position: absolute;
top: 100px;
width: 100%;
}
.section1 .title-box p{
    font-size: 60px;
}
.section1 .title-box a{
display: block;
width: 200px;
height: 48px;
background: url(../images/link2.png) no-repeat;
margin:20px auto;
}
.section1 .title-box a:hover{
    background-position:-200px 0;
}
.section1 .ball1{
    position: absolute;
    width: 13.2%;
    top: 22.7%;
    left: 20%;
    animation: ballSport infinite linear 5s alternate;
}
.section1 .ball2{
    position: absolute;
    width: 22.3%;
    top: 49.8%;
    left:65.16%;
    animation: ballSport infinite linear 3s alternate;
}
.section1 .ship{
    position: absolute;
    width: 7.2%;
    top: 40.18%;
    left:63.9%;
    animation: shipSport infinite linear 30s alternate;
}
/* 第二张 */
.section video{
    width: 100%;
   height: 100%;
   
}

.section .word-box{
   
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    left: 18%;
    color: #ffffff;
    letter-spacing: 2px;
    display: none;
    
}
.section .word-box .line{
    width: 28px;
    height: 3px;
    background-color: #5e5e5e;
    margin: 20px 0;
}
.section .word-box p:first-child{
    font-size: 60px;
}
.section .word-box .normal{
    font-size: 33px;
}
.section .word-box p:last-child{
    font-size: 12px;
}
.word-box div:last-child{
    width: 200px;
    height: 48px;
    margin-top: 40px;
    background-image: url(../images/link2.png);
}
.word-box div:last-child:hover{
  
    background-position: -200px 0;
    cursor: pointer;
}
/* //底部 */
footer{
    width: 100%;
    height: 120px;
    background-color: #131416;
    position: absolute;
    left: 0;
    bottom: 0;
    padding-top: 38px;
    text-align: center;
    line-height: 22px;
    font-size: 12px;
    color: #4a4a4a;
}
/* 两个小球运动动画 */
@keyframes ballSport{
    from{
      margin-top: 0;
    }
    to{
        margin-top:-20px;
    }
}
/* 卫星运动动画 */
@keyframes shipSport{
    from{
        transform: rotate(0deg);
    }
    to{
        transform: rotate(-40deg);
    }
}
#fp-nav ul li a.active span{
    background-color:rgba(255,255,255,0.9);
}